/Engine/Source/Runtime/Engine/Public/Animation/AnimInstanceProxy.h
Check for whether a native rule is bound to the specified transition.
bool HasNativeTransitionBinding ( const [FName](API\Runtime\Core\UObject\FName) & MachineName, const [FName](API\Runtime\Core\UObject\FName) & PrevStateName, const [FName](API\Runtime\Core\UObject\FName) & NextStateName, [FName](API\Runtime\Core\UObject\FName) & OutBindingName )